Television apparatus



P. P. HOLZER, SR

TELEVISION APPARATUS Nov; 13, 1934.

2 Sheets-Sheet .Filed Jan. 27, 1933 Patented Nov. 13, 1934 UNITED STATESPATENT v OFFICE 1 Claim.

i: ject the elimination of various light absorbing elements, such asprisms, mirrors, etc., ordinarily employed in television receivers.

Among other objects, the present invention is v intended to provide anovel arrangement of the scanning light or glow lamp with respect to thescanning disc.

Another object of the invention is to pro-vide novel synchronizing meansoperatively related to the scanning disc.

A further object of the invention is to provide a scanning disc havinggreater capacity. for the transmission of image signals therethrough.

A still further object of the invention is to provide a device which issimple to operate, and also to improve devices of the characterdescribed'in sundry details hereinafter referred to and particularlypointed out in the appended claim.

One embodiment of the present invention is shown for illustrativepurposes in the accompanying drawings, in which Fig. 1 is a rear view ofa portion of television apparatus embodying features of the presentinvention;

) Fig. 2 is a vertical transverse sectional view of the structureillustrated in Fig. l, and taken substantially as indicated by the line2-2 thereof; Fig. 3 is a fragmentary transverse sectional view takensubstantially as indicated by the line 3-3 of Fig. 2; and

Fig. 4 is a scanning band employed for straight line scanning, andillustrating my improved arrangement of glow lamp with respect thereto.

The illustrative embodiment of the present invention comprises ascanning member shown, in the present instance, as a rotatable disc 5having a plurality of series of scanning holes 6 formed therein, theseries of holes, in the present instance, being three in number, andeach containing sixteen holes'spaced along curved lines eccentric to thecenter line of rotation of the disc 5, thereby providing for curved linescanning, it being understood, however, that the present invention isequally applicable to straight line scanning as may be provided by theuse of a scanning drum or a scanning belt, the latter being illustratedin Fig. 4 as a band 5a formed of flexible material trained aroundrotatable guide pulleys 7 and having a plurality of scanning holes 60,formed therein.

In the embodiment shown in Figs. 1 and 2, the

scanning disc 5 is secured to one end of a motor shaft 8 by which theseries of holes 6 formed in the disc are successively rotated or movedpast an aperture 9 formed in a diaphragm 11 and a glow lamp or recordingtube 12, preferably of the neon type, the tube 12 being mounted on theopposite side of the diaphragm 11 from the disc 5 and supported ininverted position on a bracket 13 suitably mounted in a housing orcasing indicated as a Whole by the numeral 14, the lamp 12 beingsuitably connected by means of conductors 15 with any suitabletelevision receiving circuit (not shown).

The motor shaft 8, in the present instance is rotatably mounted in amotor frame 16, which in turn is rotatably mounted in brackets 17suitably supported in the housing or casing 14, the motor frame 16 beingprovided with a plate 18 movable with the frame and formed preferably ofinsulating material and in which a plurality of arcuate contacts 19 aremounted.

Mounted on one of the bracket members 17 and insulated therefrom are aplurality of brush contacts 21 engageable respectively with the arcuatecontacts 19 and connected by means of conductors 22 with a suitablesource of electrical energy, it being understood that by reason of thearcuate shape of the contacts 19, the motor frame and plate 18 may berotated with respect to the brackets 17 while maintaining electricalconnection with the source of current supply through conductors 23operatively connected to the arcuate contacts 19, and conductors 22connected to the brush contacts 21, thereby providing a flexiblearrangement for rotating the scanning disc 5 and permitting the rotationof the motor frame in a manner to synchronize the rotation of the disc 5and scanning holes 6 with the image signals received by the glow lamp ortube 12, it being further understood that, if desired, the motor fordriving the disc 5 may be of the synchronous type for maintaining therotation of the disc 5 and holes 6 in synchronism with the imagesignals.

For rotating the motor frame 16, a synchronizing knob or handle 24 maybe extended through a front panel 25 of the frame 14 to provideconvenient access in synchronizing the scanning holes 6 and imagesignals, and for preventing accidental rotation or displacement of themotor frame 16 after the device has been synchronized, a friction plate26 is yieldingly urged against the hub 27, formed on the motor frame, bysprings 28 positioned between the plate 26 and a. portion of the panel25, the plate 26'being secured against rotation by a pin 29 mounted onone of the brackets 1'7 and positioned between a pair of fingers or lugs31 formed on the plate 26.

For projecting the image signals received by the lamp 12 onto a screen,or the like, (not shown) a plurality of aligned condenser lenses arepositioned on the opposite side of the scanning disc 5 from thediaphragm 11 and lamp 12 and in substantial alignment with the lamp,aperture 9 of the diaphragm and path of rotation of the series of holes6'formed in the disc, the condenser in the present instance comprising aplane-convex lens 32 and a converging concavo-convex lens 33 spaced fromeach other, and having a double convex lens 34 positioned between thelenses 32 and 33, the condenser structure being mounted in a .tube 35having a plurality of teeth 36 in one side thereof adapted to be engagedby a pinion 37 mounted on a rotatable shaft 38, on which is also secureda handle or adjusting knob 39 by which the pinion may be rotated in amanner to properly focus the image signals on the screen.

Itwill be observed from the foregoing description that the presentinvention provides a structure where, by arranging the glow lamp ininverted position with respect to the apparatus and scanning disc 5, theimage signals may be transmitted to the screen in upright normalposition, thereby avoiding the use of light absorbing elements, such asprisms, mirrors, etc., ordinarily used for reversing the image signals,and permittingthe use of a lower grade of glow lamp than is nowrequired.

It will be observed also that the present invention provides novel meansfor bringing'the rotation of the disc 5 and scanning holes 6 formedthereinin synchronism with the image signals received by the lamp 12.

It has been determined that the holes 6 in the scanning disc 5 may varyin size from one-sixteenth inch to nine-sixteenths inch in diameter,

thereby permitting free passage of image signals therethrough, and thatby reason of the movable arrangement of the condenser lenses, the imagesignals may be focused to the proper size on the screen.

In the structure illustrated in Fig. 4, a glow lamp or neon tube 12a maybe arranged in inverted position between the pulleys '7 and within theband 5a in a manner to project the image signals received by the tubethrough the scanning holes 6a in much the same manner as illustrated inFigs. 1 and 2.

1 I Obviously, the present invention is not limited to the preciseconstruction, arrangement and combination of parts shown and describedas the same maybe variously modified. Moreover, all the features of theinvention need not be used conjointly as the same may beused toadvantage in variously different combinations and sub-combinations.

What I claim as new and desire to secure by Letters Patent is:

In an apparatus of the class described, the combination of a rotatablescanning disc having a plurality of series of scanning holes formedtherein and substantially uniformly spaced along a plurality ofannularly spaced lines eccentric with the centerline, of rotation ofsaid disc, said holes being of a uniform diameter between ninesixty-fourths and nine sixteenths of an inch, a glow lamp radiallyspaced from said center line and in inverted position with respect tothe apparatus, a diaphragm having an unobstructed aperture formedtherein between said disc and lamp, and a plurality of operativelyaligned condenser lenses at the opposite side of said disc from saidlamp and in alignment therewith and with the aperture formed in saiddiaphragm and the path of rotation of said series of holes formed insaid disc.

PHILIP P. HoLzEasR.

